Picture frame



FIG. 1 is a front elevation view of a picture frame according to the present invention;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear perspective view thereof; and,

FIG. 5 is a cross-sectional view taken along line 5--5 in FIG. 1. 

The ornamental design for a picture frame, as shown and described. 